When night falls in Manila, a wave of young people scurry into the skyscrapers which criss-cross the city.
They're call centre agents, and because most of their clients are on the other side of the world, the night shift is their busiest time.
Last year, with more than 600,000 call centre workers, the Philippines officially overtook India as the world's call centre capital.
If you phone up to book a flight, buy a theatre ticket or complain that water is cascading out of your washing machine, you're now more likely to speak to a Filipino than an Indian.
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